WO2008114160A1 - Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same - Google Patents

Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same Download PDF

Info

Publication number
WO2008114160A1
WO2008114160A1 PCT/IB2008/050859 IB2008050859W WO2008114160A1 WO 2008114160 A1 WO2008114160 A1 WO 2008114160A1 IB 2008050859 W IB2008050859 W IB 2008050859W WO 2008114160 A1 WO2008114160 A1 WO 2008114160A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
layer stack
extended cavity
transparent substrate
distributed bragg
Prior art date
Application number
PCT/IB2008/050859
Other languages
French (fr)
Inventor
Holger Moench
Adriaan Valster
Martin Grabherr
Original Assignee
Philips Intellectual Property & Standards Gmbh
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP07104291.5 priority Critical
Priority to EP07104291 priority
Application filed by Philips Intellectual Property & Standards Gmbh, Koninklijke Philips Electronics N.V. filed Critical Philips Intellectual Property & Standards Gmbh
Publication of WO2008114160A1 publication Critical patent/WO2008114160A1/en

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/10Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/18Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
    • H01S5/183Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
    • H01S5/18305Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL] with emission through the substrate, i.e. bottom emission
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/04Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042Electrical excitation ; Circuits therefor
    • H01S5/0425Electrodes, e.g. characterised by the structure
    • H01S5/04256Electrodes, e.g. characterised by the structure characterised by the configuration
    • H01S5/04257Electrodes, e.g. characterised by the structure characterised by the configuration having positive and negative electrodes on the same side of the substrate
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/10Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/14External cavity lasers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling a device placed within the cavity
    • H01S3/108Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling a device placed within the cavity using a non-linear optical device, e.g. exhibiting Brillouin- or Raman-scattering
    • H01S3/109Frequency multiplying, e.g. harmonic generation
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/02Structural details or components not essential to laser action
    • H01S5/0206Substrates, e.g. growth, shape, material, removal or bonding
    • H01S5/0215Bonding to the substrate
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/02Structural details or components not essential to laser action
    • H01S5/0206Substrates, e.g. growth, shape, material, removal or bonding
    • H01S5/0217Removal of the substrate
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/02Structural details or components not essential to laser action
    • H01S5/022Mountings; Housings
    • H01S5/0235Method for mounting laser chips
    • H01S5/02355Fixing laser chips on mounts
    • H01S5/0237Fixing laser chips on mounts by soldering
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00Semiconductor lasers
    • H01S5/02Structural details or components not essential to laser action
    • H01S5/024Arrangements for thermal management

Abstract

The present invention relates to a method of manufacturing the light emitting component of a VECSEL and the corresponding VECSEL. In the method a layer stack (2) is epitaxially grown on a semiconductor substrate (1). The layer stack comprises an active region (4), an upper distributed Bragg reflector (5) and a n-or p- doped current injection layer (13) arranged between the active region (4) and the semiconductor substrate (1). A mechanical support (6) or submount is bonded to an upper side of the layer stack (2) and the semiconductor substrate (1) is subsequently removed. A metallization layer (7) is optionally deposited on the lower side of the layer stack (2) and an optically transparent substrate (8) is bonded to this lower side. The proposed method allows the manufacturing of such a component in a standard manner and results in a VECSEL with a homogenous current injection and high efficiency of heat dissipation.

Description

VERTICAL EXTENDED CAVITY SURFACE EMISSION LASER AND METHOD FOR MANUFACTURING A LIGHT EMITTING COMPONENT OF THE SAME
FIELD OF THE INVENTION
The present invention relates to a vertical extended cavity surface emission laser (VECSEL) comprising an extended mirror forming a first end mirror of the extended cavity, a layer stack having at least an active region for light emission and a distributed Bragg reflector (DBR) forming the second end mirror of said extended cavity, and a substrate to which the layer stack is attached. The invention also refers to a method of manufacturing a light emitting component of such a vertical extended cavity surface emission laser.
Vertical extended cavity surface emitting lasers are a promising technology for projection applications. The IR emitting components of such a laser can be converted to blue, green and red light by second harmonic generation with nonlinear crystals inside the extended laser cavity.
BACKGROUND OF THE INVENTION Vertical cavity surface emitting lasers (VCSEL) are typically formed of a layer stack comprising an active (gain) region, sandwiched between two distributed Bragg reflectors. The layer stack is composed of appropriate dielectric and/or semiconductor layer sequences. The laser cavity is formed of the two DBRs, one of which, for outcoupling purposes, has a lower reflectance at the lasing wavelength than the other one. In case of a vertical extended cavity surface emission laser, the resonating cavity is formed between the DBR having the higher reflectance and an extended mirror. The second DBR which would be arranged inside this extended cavity can be omitted or is designed to have even lower reflectance at the lasing wavelength compared to a VCSEL. For stable operation of such a VECSEL an optical lens is required inside the extended cavity to form a stable resonator with two flat end mirrors. Furthermore, the heat generated during operation of such a laser must be efficiently dissipated from the active region.
WO 2004/086578 A2 discloses to attach an optically transparent substrate to the free side of the layer stack inside the extended cavity. This transparent substrate is used as a heat spreader and designed to have one or more further selected properties to influence the light which is output from the laser. Examples of such further properties are polarizing properties to achieve a desired polarization of the laser radiation, a nonlinear optical response to achieve frequency doubling of the laser radiation or the provision of a curved surface to focus or defocus the output light. The thermal conductivity of transparent substrates however is not sufficient to use them as an effective heat sink. Furthermore, a homogeneous current injection into the active region is difficult to achieve when the transparent substrate is not electrically conductive.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method of manufacturing the light emitting component of a vertical extended cavity surface emission laser as well as a vertical extended cavity surface emitting laser comprising such a component, which method can be performed with standard semiconductor manufacturing processes and achieves a light emitting component with a homogenous current injection and high efficiency of heat dissipation. The object is achieved with the method and vertical extended cavity surface emission laser according to claims 1 and 13. Advantageous embodiments of the method and laser are subject matter of the dependent claims or are described in the subsequent portions of the description.
In the proposed method a layer stack is epitaxially grown on a semiconductor substrate. Said layer stack comprises semiconductor layers forming an active region, an upper layer sequence forming an upper distributed Bragg reflector and a n- or p-doped current injection layer between the semiconductor substrate and the active region. The upper distributed Bragg reflector is designed to have a high reflectance for the lasing wavelength. The layer materials and layer thicknesses as well as the procedure for epitaxially growing and structuring such a layer stack to form a vertical light emitting diode is generally known in the art. Optionally the layer stack is grown such that it comprises also a lower layer sequence forming a lower distributed Bragg reflector between the active region and the n- or p-doped current injection and spreading layer. This lower distributed Bragg reflector is designed to have a lower reflectance for the lasing wavelength than the upper distributed Bragg reflector. At first the upper part of the substrate with the layer stack is structured and partly metallised to generate electrical confinement. In the next step the semiconductor substrate with the layer stack is bonded with the upper side of the layer stack to a support or submount substrate. The semiconductor substrate is then removed, for example by etching or ablation. Then an optically transparent substrate, for example a glass substrate, is bonded to the lower side of the layer stack resulting in an epitaxially grown stack of mirror layers (forming the DBR(s)), gain layers (forming the active region) and an n- or p-doped current injection layer on the side of the optically transparent substrate.
This light emitting component can then be mounted to form a vertical extended cavity surface emitting laser together with an extended mirror, wherein the upper distributed Bragg reflector forms one of the end mirrors and the extended mirror forms the other end mirror of the extended cavity. The transparent substrate is placed inside of this extended cavity and can be designed to provide further functions influencing the optical properties of the laser radiation. In a preferred embodiment, following the step of removing the semiconductor substrate, a metallization layer is deposited on the now uncovered lower side of the layer stack. This metallization layer can be additionally structured, if necessary for operation of the light emitting component.
In a further preferred embodiment, all method steps are performed on a wafer level. This means that the semiconductor substrate is a wafer substrate on which said layer stack is epitaxially grown and structured to form a multiplicity of vertical light emitting diodes side by side. After wafer-bonding of said optically transparent substrate, the resulting substrate and layer stack is cut into single components, each component comprising one or several of the light emitting diodes.
The support substrate can be removed prior to the step of cutting into individual components. An appropriate heat sink can then be bonded to this side of the component, preferably prior to the cutting step. As an alternative, the submount structure bonded to the layer stack on the upper side can already form such a heat sink, for example made of a metal-ceramic composite with integrated conductor structures for electrically contacting the layer stack from one side. The submount structure then remains on the components.
The proposed vertical extended cavity surface emitting laser according to the present invention therefore comprises at least an extended mirror forming a first end mirror of an extended cavity, an optically transparent substrate, a layer stack and a heat sink. The layer stack has an active region (gain medium), an outer distributed Bragg reflector and a n- or p-doped current injection layer arranged on the side of the optically transparent substrate. The outer distributed Bragg reflector forms the second end mirror of the extended cavity. Optionally, the layer stack also comprises an inner distributed Bragg reflector sandwiched between the active region and the current injection layer, the inner distributed Bragg reflector having a lower reflectance for the lasing wavelength than the outer distributed Bragg reflector. The transparent substrate is arranged inside of the extended cavity and attached to the layer stack at the side of the current injection layer. The heat sink is attached to the layer stack at the side of the outer distributed Bragg reflector. The proposed vertical extended cavity surface emission laser furthermore preferably comprises a metallic layer sandwiched between the n- or p-doped current injection layer and said transparent substrate.
Due to the substitution of the semiconductor substrate by the optically transparent substrate, this now transparent side can be used for light emission of the light emitting component, i.e. can be placed inside of the extended cavity. This allows the attachment of an efficient heat sink on the outer side of the light emitting component very close to the heat producing active region which results in a highly efficient heat dissipation. The metallization layer, which is included in a preferred embodiment, improves the homogenization of the current distribution and allows to use a very thin n- or p-doped current injection layer without the need of a conductive substrate. This metal layer can be electrically contacted either from the side of the transparent substrate through appropriate via holes which can be etched in the substrate or the current injection layer is contacted from the side of the upper DBR through appropriate holes or groves as is known in the art (see e.g. p-conatct 14 in Figs. 2 and 3 showing a metallization contacting the current injection layer 13). The method can be applied with known techniques of producing vertical cavity surface emitting lasers allowing a cost effective mass production.
The layer thickness and doping concentration of the current injection layer are preferably in the following ranges, dependent on the way of contacting and doping (p- or n-type):
Casel: contacting via the metal layer: thickness of doped layer 100- lOOOnm, p-type 10E18-10E20 cm3, n-type 10E17-10E18 cm3.
Case 2: contacting via the doped layer: thickness of doped layer 100- lOOOnm, p-type 10E19-10E20 cm"3, n-type 1OE 17- 1OE 18 cm"3. Case 3 : contacting via the doped layer, no metal layer present: thickness of doped layer 500-5000nm, p-type 10E19-10E20 cm"3, n-type 10E17-10E18 I/cm"3.
In cases 1 and 2 the preferred thickness of the metal layer is between 1 and IOnm when unpatterned and between 10 and 50 nm when patterned.
The thickness of the doped layer in any case is selected to be phase matched to standing wave pattern of the laser radiation inside of the extended cavity. As can be seen from these preferred ranges, the provision of the metal layer allows the thickness of the current injection layer to be reduced, which results in less absorption of the laser radiation in this layer. Alternatively or in addition the doping concentration of this layer can be reduced with the same result.
In a preferred embodiment, the transparent substrate is already prefabricated to provide further optical functions inside of the vertical extended cavity surface emitting laser. The transparent substrate, in particular a glass substrate, can for example be structured to achieve the effect of a collimating lens. Generally, the transparent substrate can also be formed of a layer stack of optically transparent material layers. The transparent substrate can also be made of a birefringent material in order to provide the optical function of a polarizer or can be made of a nonlinear optical material for frequency doubling purposes. In the latter case the light emitted by the component is frequency doubled in this substrate to achieve a laser emitting, for example, in the green wavelength region. Nevertheless, such optical components like a lens or a frequency doubling crystal can also be arranged inside of the extended laser cavity between the light emitting component and the extended mirror for the same purposes. Furthermore, the transparent substrate may have dielectric coatings on one or both sides in order to lower the surface reflectivity or to provide a wavelength filtering function. In another embodiment the transparent substrate can be structured to form a volume Bragg grating (VBG) for appropriate wavelength stabilization of the laser emission.
The metallic layer must be designed or arranged such inside of the extended laser cavity that this metallization does not prohibit the laser operation. To this end, this metallization may be structured to provide openings or holes at the positions at which the laser radiation propagates inside the extended cavity. With this structuring of the metallization layer it is also possible to additionally influence the mode structure of the laser radiation by appropriate optical confinement. In a further preferred embodiment the metallization layer is arranged in a node of a standing wave of the laser radiation formed inside of the laser cavity. In this position the metallization layer does not disturb the laser operation even if the metallization layer is not structured. Preferably the metallization layer in this case has a very low thickness of less than 100 more preferably less than 10 nm. In the proposed method all wafer processing for generating the layer stack can be done in the standard way of producing VCSELs. After finishing the processes the substrate transfer is done.
Preferably the semiconductor substrate on which the layer stack is epitaxially grown is a p- or n-doped GaAs substrate or a semiinsulating GaAs substrate. In one such embodiment, the lower DBR is formed of a p-doped layer sequence of between 4 and 13 pairs of p-doped layers with alternating refractive index, whereas the upper DBR is formed of more than 20 pairs of n-doped layers with alternating refractive index. In this case a p-doped current injection layer is formed between the metallization and the lower DBR.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described herein after.
BRIEF DESCRIPTION OF THE DRAWINGS
The proposed method and vertical extended cavity surface emission laser are described in the following by way of examples in connection with the accompanying figures without limiting the scope of protection as defined by the claims. The figures show:
Fig. 1 a schematic view showing method steps of the proposed method;
Fig. 2 a partial cut view of a VECSEL according to a first embodiment of the present invention; Fig. 3 a partial cut view of a VECSEL according to a second embodiment of the present invention; and
Fig .4 a partial cut view of a VECSEL according to a third embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENTS
Figure 1 shows a sequence of method steps which are performed according to an exemplary embodiment of the proposed method. In a first step, according to Figure Ia, a GaAs semiconductor substrate 1 is provided. A layer stack 2 forming a p-doped current injection layer 13, a lower distributed Bragg reflector 3, an active region 4 and an upper distributed Bragg reflector 5 is epitaxially grown on the semiconductor substrate 1 (Figure Ib). The two DBRs 3, 5 are stacks of many pairs of semiconductor layers, in the most simple case each λ/4 thick at the design wavelength λ, i.e. the wavelength of the laser in the semiconductor material. Each pair is composed of a high and low refractive index layer, for example of AlGaAs. The upper DBR 5 is designed to have a reflectance of 98-99.9% (or even > 99,9 %) at the laser wavelength and is therefore formed of more than 20 p-doped layer pairs. In the case of the lower DBR 3, this DBR is formed of only between 4 to 13 pairs of n-doped layers resulting in a lower reflectance of between 50% and 95% at the laser wavelength. This lower reflectance is necessary since the side of the lower DBR 3 is the light output side of the light generated in the active region 4. The active region 4 may be made of a quantum well structure, for example of three InGaAs quantum wells embedded in GaAs.
In the next step the epitaxial layers are structured in the usual manner. Especially metallic contacts for p or n sides are provided. In the next step an auxiliary substrate 6 serving as a supporting substrate is bonded to the upper surface of the layer stack 2 (Figure Ic). The semiconductor substrate 1 is then removed by etching (Figure Id). Following this etching step a metallization layer 7 is deposited on the lower side of the layer stack 2 (Figure Ie). Then a glass substrate 8 is bonded to the lower side of the layer stack 2 according to Figure If. The metallization layer 7 is now sandwiched between the layer stack 2 and the glass substrate 8. The auxiliary substrate 6 can then be removed. The result is a layer stack 2 on the glass substrate 8 with a metallization layer 7 sandwiched in between. This substrate and layer stack is then cut into individual components or chips 9 in the usual manner, for example by sawing. To the upper side of these components an appropriate heat sink 10 is attached. These components emit light through the glass substrate and are used as the light emitting component of a vertical extended cavity surface emitting laser as shown for example in Figures 2 or 3.
Figure 2 shows an example for such a VECSEL in a partial cut view. In this figure the layer stack 2 attached to the glass substrate 8 is shown on one side of the extended cavity and an extended mirror 11 on the opposing side. The extended mirror 11 may be a dichroitic mirror and represents the first end mirror of the extended cavity or it may be a VBG with a spectrally narrow (<0.5nm) reflectance. The second end mirror is formed of the upper DBR 5 (in this figure on the lower side) of the layer stack 2. The same reference signs in Figs. 2 and 3 represent the same components as already described in connection with Fig. 1. Between the glass substrate 8 and the extended mirror 11 a further optical component 12, for example a frequency doubling nonlinear optical crystal, may be arranged. Nevertheless, also other optical components may be arranged between the extended mirror 11 and the glass substrate 8. The glass substrate 8 is covered on the side of the layer stack by metallization 7 and highly conductive p-doped layer 13, the latter being already formed when epitaxially growing the layer stack 2. Preferably before removing the semiconductor substrate the contacting of the layers 13 and 7 is done via lithography and subsequent etching. To this end grooves are etched in the layer stack 2 after epitaxially growing the stack. After etching the grooves an isolation layer and subsequently an appropriate metallization are deposited and structured to provide a p-contact 14 for the p-doped injection layer 13 and a n- contact 15 for the opposing side of the layer stack.
Aheat sink can then be soldered or bonded to the free side of the layer stack 2. All electrical connections and thermal contacts can be made through this heat sink. In this embodiment a lens 16 is formed inside of the glass substrate 8. Such a lens can be formed in the substrate by appropriate techniques known in the art prior to the bonding of the substrate to the layer stack, for example by appropriately modifying the refractive index of the glass inside of the glass substrate 8. Also an array of lenses can be scribed into this glass substrate. A further possibility is to heat press or mold a lens onto the surface of the glass substrate.
Figure 3 shows a further embodiment which is different from the embodiment of Figure 2 only in the missing lens inside the glass substrate 8 and the attached heat sink 10. The further construction of this device is the same as already described with reference to Figure 2.
Figure 4 shows a further embodiment which is different from the embodiment of Figure 2 in the missing lens inside the glass substrate 8, the missing lower DBR and the missing metal layer. The further construction of this device is the same as already described with reference to Figure 2.
While the invention has been illustrated and described in detail in the drawings and forgoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive, the invention is not limited to the disclosed embodiments. The different embodiments described above and in the claims can also be combined. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure and the appended claims. For example the VECSEL may also be formed of an array of light emitting components in a side by side arrangement to provide a VECSEL array. In this case the array shares a single transparent substrate. It is also possible to combine the glass substrate with other transparent plates with different optical functions, e.g. a stack can be formed out of a glass plate, a plate made of a nonlinear optical material and the extended mirror (VBG or Dichroic). This stack can be prefabricated prior to the bonding to the semiconductor structure.
All optical surfaces may be coated in the usual manner by antireflection layers or by reflective dichroic coatings for either the fundamental IR radiation or the frequency doubled (e.g. green) radiation.
In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope of these claims.
LIST OF REFERENCE SIGNS
1 semiconductor substrate 2 layer stack
3 lower DBR
4 active region
5 upper DBR
6 support substrate 7 metallization layer
8 glass substrate
9 light emitting component
10 heat sink
11 extended mirror 12 frequency doubling crystal
13 p-doped current injection layer
14 p-contact
15 n-contact
16 integrated lens

Claims

CLAIMS:
1. Vertical extended cavity surface emission laser comprising at least the following components:
- an extended mirror (11) forming a first end mirror of an extended cavity,
- a distributed Bragg reflector (5) for a lasing wavelength forming a second end mirror of the extended cavity,
- an active region (4) for light emission being arranged on an inner side of the distributed Bragg reflector, said active region (4) and said distributed Bragg reflector (5) forming at least part of a layer stack (2),
- an optically transparent substrate (8) inside of said extended cavity being attached to the layer stack (2) and
- a heat sink (10) being attached to the layer stack (2) at an outer side of the distributed Bragg reflector (5), wherein a current injection layer (13) is sandwiched between the active region (4) and the optically transparent substrate (8) and designed or arranged to allow laser operation.
2. Vertical extended cavity surface emission laser according to claim 1, wherein an additional metallic layer (7) is sandwiched between said current injection layer (13) and said transparent substrate (8).
3. Vertical extended cavity surface emission laser according to claim 1 or claim 2, wherein an additional distributed Bragg reflector (3) is sandwiched between the active region (4) and the current injection layer (13) with a reflectivity which is lower for the lasing wavelength than the reflectivity of said distributed Bragg reflector (5) forming the second end mirror, said additional distributed Bragg reflector (3) being formed of between 4 and 13 pairs of layers.
4. Vertical extended cavity surface emission laser according to claim 1 or claim 2, wherein the transparent substrate (8) has a dichroic coating with a reflectivity which is lower for the lasing wavelength than the reflectivity of said distributed Bragg reflector (5) forming the second end mirror.
5. Vertical extended cavity surface emission laser according to claim 1 or claim 2, wherein said optically transparent substrate (8) is a glass substrate.
6. Vertical extended cavity surface emission laser according to claim 1 or claim 2, wherein further optical components (12) are arranged inside said extended cavity between said extended mirror (11) and said transparent substrate (8).
7. Vertical extended cavity surface emission laser according to claim 3, wherein said distributed Bragg reflector (5) forming the second end mirror is formed of more than 20 pairs of layers.
8. Vertical extended cavity surface emission laser according to claim 2, wherein said metallic layer (7) is structured to influence current distribution in the active region (4) and/or optical behavior of the laser.
9. Vertical extended cavity surface emission laser according to claim 2, wherein said metallic layer (7) is arranged in a node of a standing wave of laser radiation forming in the extended cavity.
10. Vertical extended cavity surface emission laser according to claim 1 or claim 2, wherein said heat sink (10) comprises a conductor structure for electrically contacting said layer stack (2).
11. Vertical extended cavity surface emission laser according to claim 1 or claim 2, wherein the transparent substrate (8) is designed to perform an optical function, in particular designed to form a polarizer, a lens (16) or a frequency doubling crystal.
12. Vertical extended cavity surface emission laser according to claim 1 or claim 2, wherein the transparent substrate (8) is formed of a sandwich of different material layers, at least some of which having different optical functions.
13. A method of manufacturing the light emitting component of a vertical extended cavity surface emission laser comprising at least the following steps:
- epitaxially growing a layer stack (2) on a semiconductor substrate (1), said layer stack (2) comprising at least layers forming an active region (4) for light emission, an upper layer sequence forming an upper distributed Bragg reflector (5) and an n- or p- doped current injection layer (13) sandwiched between the semiconductor substrate (1) and the active region (4),
- attaching a mechanical support (6) or submount to an upper side of the layer stack (2),
- removing the semiconductor substrate (1), and - bonding an optically transparent substrate (8) to the lower side of the layer stack (2).
14. The method of claim 13 , wherein a metallization layer (7) is deposited on the lower side of the layer stack (2) between the steps of removing the semiconductor substrate (1) and bonding an optically transparent substrate (8) to the lower side of the layer stack (2).
15. The method of claim 13 or 14, wherein the epitaxially grown layer stack (2) also comprises a lower layer sequence forming a lower distributed Bragg reflector (3) between the active region (4) and the n- or p-doped current injection layer (13).
16. The method of claim 13 or 14, wherein the mechanical support (6) is bonded to the upper side of the layer stack (2) and removed after the step of bonding the optically transparent substrate (8) to the lower side of the layer stack (2).
17. The method of claim 13 or 14, wherein the submount is bonded or soldered to the upper side of the layer stack (2).
18. The method of claim 14, wherein the metallization layer (7) is structured to provide holes for light transmittance and/or to provide additional optical functionality like polarization or mode control.
19. The method of claim 13 or 14, wherein said semiconductor substrate (1) is a wafer substrate, said layer stack (2) is epitaxially grown to form a multiplicity of vertical light emitting diodes side by side on said wafer substrate and, after bonding of said optically transparent substrate (8), the resulting substrate and layer stack is cut into single components, each component comprising one or several of the light emitting diodes.
PCT/IB2008/050859 2007-03-16 2008-03-10 Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same WO2008114160A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07104291.5 2007-03-16
EP07104291 2007-03-16

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AT08719620T AT487256T (en) 2007-03-16 2008-03-10 SURFACE-EMITTING LASER WITH AN ADVANCED VERTICAL RESONATOR AND METHOD FOR PRODUCING AN APPROPRIATE LIGHT-EMITTING COMPONENT
US12/530,563 US8023547B2 (en) 2007-03-16 2008-03-10 Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same
DE602008003316T DE602008003316D1 (en) 2007-03-16 2008-03-10 SURFACE-EMITTING LASER WITH AN ADVANCED VERTICAL RESONATOR AND METHOD FOR PRODUCING AN APPROPRIATE LIGHT-EMITTING COMPONENT
CN2008800086486A CN101636887B (en) 2007-03-16 2008-03-10 Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same
JP2009553253A JP4927178B2 (en) 2007-03-16 2008-03-10 Vertical external cavity surface emitting laser and method for manufacturing the light emitting component
EP08719620A EP2127046B1 (en) 2007-03-16 2008-03-10 Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same

Publications (1)

Publication Number Publication Date
WO2008114160A1 true WO2008114160A1 (en) 2008-09-25

Family

ID=39494480

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/050859 WO2008114160A1 (en) 2007-03-16 2008-03-10 Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same

Country Status (7)

Country Link
US (1) US8023547B2 (en)
EP (1) EP2127046B1 (en)
JP (1) JP4927178B2 (en)
CN (1) CN101636887B (en)
AT (1) AT487256T (en)
DE (1) DE602008003316D1 (en)
WO (1) WO2008114160A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013229580A (en) * 2012-03-22 2013-11-07 Palo Alto Research Center Inc Surface emitting laser incorporating third reflector

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9735198B2 (en) 2012-03-30 2017-08-15 Cree, Inc. Substrate based light emitter devices, components, and related methods
US9300062B2 (en) * 2010-11-22 2016-03-29 Cree, Inc. Attachment devices and methods for light emitting devices
CN104081112B (en) 2011-11-07 2016-03-16 克利公司 High voltage array light-emitting diode (LED) device, equipment and method
US9172213B2 (en) * 2012-03-14 2015-10-27 Koninklijke Philips N.V. VCSEL module and manufacture thereof
US10134961B2 (en) 2012-03-30 2018-11-20 Cree, Inc. Submount based surface mount device (SMD) light emitter components and methods
USD740453S1 (en) 2013-06-27 2015-10-06 Cree, Inc. Light emitter unit
USD823492S1 (en) 2016-10-04 2018-07-17 Cree, Inc. Light emitting device
CN108736315A (en) * 2017-04-13 2018-11-02 光环科技股份有限公司 Vertical cavity surface emitting laser structure and preparation method
CN111244759A (en) * 2020-01-16 2020-06-05 常州纵慧芯光半导体科技有限公司 VCSEL device with transparent top lining and back positive and negative electrodes and preparation method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748007A2 (en) * 1995-06-08 1996-12-11 Hewlett-Packard Company Surface-emitting lasers
US20040182914A1 (en) * 2003-03-19 2004-09-23 Emcore Corporation Flip-chip light emitting diode with a thermally stable multiple layer reflective p-type contact
WO2004086578A2 (en) 2003-03-24 2004-10-07 The University Of Strathclyde Improvements in and relating to vertical-cavity semiconductor optical devices
WO2005117070A2 (en) * 2004-05-28 2005-12-08 Osram Opto Semiconductors Gmbh Surface-emitting semiconductor laser component featuring emission in a vertical direction
US20060023757A1 (en) * 2004-07-30 2006-02-02 Aram Mooradian Apparatus, system, and method for wavelength conversion of mode-locked extended cavity surface emitting semiconductor lasers
US20060078027A1 (en) * 2004-10-11 2006-04-13 Samsung Electronics Co., Ltd. Laser pumping unit and high power laser device tunnel junction including the same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5724376A (en) * 1995-11-30 1998-03-03 Hewlett-Packard Company Transparent substrate vertical cavity surface emitting lasers fabricated by semiconductor wafer bonding
JPH09246668A (en) * 1996-03-12 1997-09-19 Fujitsu Ltd Surface light emission type semiconductor laser device and manufacture thereof
US6803603B1 (en) * 1999-06-23 2004-10-12 Kabushiki Kaisha Toshiba Semiconductor light-emitting element
US6760359B2 (en) * 2000-04-28 2004-07-06 Photodigm, Inc. Grating-outcoupled surface-emitting lasers with flared gain regions
KR100667743B1 (en) * 2000-10-04 2007-01-12 삼성전자주식회사 Vertical cavity surface emitting laser having micro-lens
US6658041B2 (en) * 2002-03-20 2003-12-02 Agilent Technologies, Inc. Wafer bonded vertical cavity surface emitting laser systems
AU2003900172A0 (en) 2003-01-15 2003-01-30 Edith Cowan University Laser array
US6979582B2 (en) * 2003-09-22 2005-12-27 National Chung-Hsing University Vertical-cavity surface emitting laser diode and method for producing the same
JP4116587B2 (en) * 2004-04-13 2008-07-09 浜松ホトニクス株式会社 Semiconductor light emitting device and manufacturing method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748007A2 (en) * 1995-06-08 1996-12-11 Hewlett-Packard Company Surface-emitting lasers
US20040182914A1 (en) * 2003-03-19 2004-09-23 Emcore Corporation Flip-chip light emitting diode with a thermally stable multiple layer reflective p-type contact
WO2004086578A2 (en) 2003-03-24 2004-10-07 The University Of Strathclyde Improvements in and relating to vertical-cavity semiconductor optical devices
WO2005117070A2 (en) * 2004-05-28 2005-12-08 Osram Opto Semiconductors Gmbh Surface-emitting semiconductor laser component featuring emission in a vertical direction
US20060023757A1 (en) * 2004-07-30 2006-02-02 Aram Mooradian Apparatus, system, and method for wavelength conversion of mode-locked extended cavity surface emitting semiconductor lasers
US20060078027A1 (en) * 2004-10-11 2006-04-13 Samsung Electronics Co., Ltd. Laser pumping unit and high power laser device tunnel junction including the same

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KEELER ET AL.: "Electrically-pumped 850 nm mircomirror VECSELs", VERTICAL-CAVITY SURFACE-EMITTING LASERS IX 26 JAN. 2005 SAN JOSE, CA, USA, vol. 5737, no. 1, 14 March 2005 (2005-03-14), Proceedings of the SPIE - The International Society for Optical Engineering SPIE - The International Society for Optical Engineering USA, pages 69 - 74, XP002484920, ISSN: 0277-786X *
KEELER G A ET AL: "Micromirrors for wafer-scale fabrication of electrically-pump VECSELs", LASERS AND ELECTRO-OPTICS, 2004. (CLEO). CONFERENCE ON SAN FRANCISCO, CA, USA MAY 20-21, 2004, PISCATAWAY, NJ, USA,IEEE, vol. 1, 17 May 2004 (2004-05-17), pages 449 - 450, XP010745333, ISBN: 978-1-55752-777-6 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013229580A (en) * 2012-03-22 2013-11-07 Palo Alto Research Center Inc Surface emitting laser incorporating third reflector

Also Published As

Publication number Publication date
AT487256T (en) 2010-11-15
US8023547B2 (en) 2011-09-20
CN101636887B (en) 2012-10-10
DE602008003316D1 (en) 2010-12-16
EP2127046A1 (en) 2009-12-02
CN101636887A (en) 2010-01-27
JP4927178B2 (en) 2012-05-09
JP2010521806A (en) 2010-06-24
EP2127046B1 (en) 2010-11-03
US20100195690A1 (en) 2010-08-05

Similar Documents

Publication Publication Date Title
US8023547B2 (en) Vertical extended cavity surface emission laser and method for manufacturing a light emitting component of the same
US7991034B2 (en) Electrically-pumped semiconductor zigzag extended cavity surface emitting lasers and superluminescent LEDs
JP4511833B2 (en) Optically pumped vertical emission semiconductor laser.
US6611543B2 (en) Vertical-cavity surface-emitting laser with metal mirror and method of fabrication of same
US6898225B2 (en) Coupled cavity high power semiconductor laser
JP5770989B2 (en) Vertical surface emitting semiconductor device
US8213480B2 (en) Multiple emitter VECSEL
US20050281308A1 (en) External cavity dual wavelength laser system
RU2623663C2 (en) Surface-emitting laser device with vertical external resonator with optical pumping
GB2399942A (en) Vertical cavity semiconductor optical devices
JP2010521806A5 (en)
US20070014325A1 (en) Optically pumped semiconductor laser
Gbele et al. Design and fabrication of hybrid metal semiconductor mirror for high-power VECSEL
Demaria et al. Design of highly efficient high-power optically pumped semiconductor disk lasers
US8611383B2 (en) Optically-pumped surface-emitting semiconductor laser with heat-spreading compound mirror-structure
US7548569B2 (en) High-power optically end-pumped external-cavity semiconductor laser
KR100627703B1 (en) hybrid metal-bonded vertical cavity surface emitting laser and fabricating method thereof
JP3802465B2 (en) Vertical cavity surface emitting semiconductor laser
EP1608049B1 (en) External cavity plural wavelength laser system
WO2020061351A2 (en) Broadband active mirror architecture for high power optically pumped semiconductor disk lasers

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880008648.6

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08719620

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2008719620

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2009553253

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 12530563

Country of ref document: US